A development board that allows the integration of the Wi-Fi module (ESP8266) with shields with a spacing compatible with UNO R3. This gives great opportunities for the development of the loT project. This board is fully compatible with NodeMCU and WeMos D1 Specification: Fully compatible with WeMos D1 ESP8266 Works based on ESP-8266EX with built-in PCB antenna USB-UART converter (CH340G) The spacing of the connectors is compatible with UNO R3 Programming with Arduino IDE possible (after installing ESP8266 Core) Digital inputs / outputs: 11 (max 3.3V / line) Support Wireless Software Update (OTA) Voltage stabilizer: 5 V / 1 A and 3.3 V Microcontroller reset button (RESET) Maximum input voltage (5.5 x 2.1 plug): 24 V DC Possibility of power supply via USB connector Tile sizes: 69 mm x 54 mm x 15 mm Mounting holes with a diameter of 3 mm Warning! The maximum allowed voltage on the lines of the ESP8266 system is 3.3 V. Make sure that the add-on module attached to the board does not force the lines of the ESP8266 system to a higher voltage than allowed. https://elecena.pl/product/22605129/wemos-d1-uno-r3-esp8266-wifi-iot-arduino 2023-02-22 https://elecena.pl/product/22605129/wemos-d1-uno-r3-esp8266-wifi-iot-arduino 2025-10-29